Crystal detector



April 13 1926. Y v 1,580,898

c. lzENsTARK CRYSTAL DETECTOR original Filed Jun v, 1922 Patented Apr. 13, 1926.

.UNrriizD 'STATE-s .',PTENT oFFlcE.,

j cnARLEsrZENsTAnK, orcriicaGa'ILLINoIs. Y f

i CRYSTAL DETECTOR.

Application filed .une 7, 1922, Serial No. 566,55). Renewed December 15, 1924.

To all whom t may concern.'

Bc it known that l. @Hamaca IznNs'rAnii, a citizen of the vUnited States, and a resident of the city of Chicago, county of Cook, and State of Illinois, have invented certain new and useful In'iproveinents inCrystal Detectors, of which the following is a specification.

My invention relates to? new and useful improvements in crystal detectors, and has for its object the provision of an eas-ily and readily adjustable swivel joint for a crystal detector.

Other objects will appear hereinafter.

The invention consists in the combinations and arrangements of parts hereinafter described and claimed.

The invention will be best understood by reference to the accompanying drawings forming a part of this specification, and in which,

Fig. 1 is an elevational view of my improved device, showing the contact pin in different positions;

Fig. 2 is a vertical sectional view on line 2-2 of Fig. 1;

Fig. 3 is a fragmentary View showing my improved swivel. joint, with the contact pin and supporting means in different positions.

rlhe form'of my invention illustrated comprises a bracket 6 mounted on a base 7 by means of one of the binding posts 8, the other binding post retaining a plate 9 in position on base 7, on the end of which plate a galena cup 10 is mounted and supported at the middle part of the base. The upper part of the bracket is curved and a slot 11 is provided near its end. A stem 13 is adjustably positioned in said slot and carries a coiled spring 14 between the head 15'of the stem and a semi-spherical bearing member 16 which is slidably mounted on the stem and is pressed against the curved portion of the bracket by said spring 14 for frictionally retaining said stem in osition on the bracket. The contact pin 1 is adjustably seated in an opening in the outer end of said stem 13, the dotted and full lines in Fig. 1 indicating the adjustability of said pin, and a washer 18 is placed on said stem between said pin and the bracket. The spring 14 this serves to retain the pin 17 in adjusted position by drawing it against said washer, and at the same time retains stem 13 in adjusted position by pressing member 16 against bracket 6. Said pin is provided with. a suitable knurled head 19, and a contact wire 20 is coiled around the lower end of said pin and extends therefrom to-Ward the galena in cu 10.,

While I have illustrated and. described the preferred form of construction for carrying I-Iaving described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a crystal detector having a galena cup; a bracket mounted onY said detector and having a curved portion; a stem passing adjustably through a slot in said curved portion; a contact pin adjustably mounted on said stem outside of said curved portion; a contact wire mounted on said pin; said pin and wire being adapted to be easlly and readily moved with relation to said galena cup; and means on said stem fork yieldably retaining said stem adjusted in said bracket and said pin adjusted in said stem and permitting convenient sliding adjustment thereof.

2. A swivel 'joint for a crystal detector comprising a bracket member; a stem adjustably mounted in a slot in said bracket member to move in a vertical plane; a contact pin adjustably mounted in the end of said stem; a member mounted on said stem; and a springbetween said member and the head of said stem permitting swinging of said stem with its pin and for frictionally retaining said member and stem engaged with said bracket.

3. A swivel' joint for a crystal detector comprising a bracket having a curved upper portion; a stem adjustably mounted in said portion; a contact pin adjustably mounted in an opening in said stem outward of said bracket; a member mounted on said stern and engaging between said pin and saidl bracket; and a spring on said stem to draw said pin against said member and said member against said bracket for retaining both said pin and stem in adjusted position.

4. A swivel joint for a crystal detector comprising a bracket having a curved upperl portion; a stem edjustably mounted n a slot in said curved portion; a Contact pin adjustably mounted in an opening in said stem outward of said curved portion; a semispherioal member' mounted on said 'stem and engaging said bracket; a Washer mounted between said pin and said bracket; and a spring on said stem operating against Said member for retaining both Said pin and said stem in adjusted position on said l0 curved portion und permit convenient edj ustment thereof.

In testimony whereof I have signed my neme to this specification.

CHARLES IZENSTARK. 

